Protractor



May 7,1946. v. M. LUZ] I 2,400,014

PROTRACTOR Filed Aug. 4, 1945 -2 Sheets-Sheet 1 Vassili Mimi INVENTOR.

- ATTORNEY y .v. M. LUZI 2,400,014

PROTRACTOR Filed Aug. 4, 1945 2 Sheets-Sheet 2 I i =s Vassz'lz' M.Luzi

INVENTOR.

ATTORNEY.

Patented May 7, 1946 UNITED- STATES PATENT OFFICE 2,400,014 mormsc'ron Vassili Mark Luzi, Manitowoc, Wis.

Application August 4, 1943, Serial No. 497,285

7 Claims.

Thi invention relates to protractors of a type for use primarily as a layout tool in marking upright surfaces of castings and the like, although certain features thereof are capable of other uses.

One object of the present invention is the provision of a protractor having a straight edge so supported and arranged that the latter may be readily applied directly against the upright face of a casting or the like and accurately positioned at any predetermined inclination and elevation thereon.

Other more specific objects and advantages will appear, expressed or implied, from the following description of an illustrative embodiment of the present invention.

In the accompanying drawings- Figure 1 is a front elevation of a protractor constructed in accordance with the present invention.

Figure 2 is a side elevation, partly in section, of the protractor shown in Figure 1.

Figure 3 is a horizontal section, taken along the line 3-3 of Figure 2.

Figur 4 is a horizontal section, taken along the line 4-4 of Figure 2.

The protractor selected for illustration is shown mounted .upon a vertical standard Ill carried by an appropriate base II. The base II is adapted to seat squarely upon the face i2 of a conventional layout table, and is of suflicient size and weight to sustain the standard In in a true vertical position. The base II is preferably disposed wholly behind the front of the standard H! where it will not interfere with a close positioning of the standard beside the casting or other object to be marked.

In this instance the protractor includes a circular plate l3 vertically arranged at the front of the standard In and fixed to a carrier shoe l4 vertically adjustable upon the standard. The standard is preferably of substantially triangular form in cross-section so as to provide oppositely inclined faces l5 adapted to bear squarely against similarly inclined interior faces it of the shoe l4. Any appropriate means, such as a clamp bolt ll, may be provided for releasably wedging the faces 16 of the shoe into tight engagement with the faces [5 of the standard in order to accurately position the shoe and plate I3 relative to the standard at any selected elevation on the latter. In this instance the bolt I1 is provided with a head l8, engaged in a vertical T-slot I! formed in the standard, and with a nut 20 threaded on the bolt and operable to releasably clamp the shoe onto the standard.

The plate l3 provides a seat for a rotatable disk 2! closely confined and centered by an encircling flange 22 formed on the periphery of the plate I3. The disk 2| is releasably retained against r0- tation by appropriate means such as a pair of clamp bolts 23, each extending through the flanged periphery 22 of the plate l3, and each having a head 24st its forward end arranged to partially overlie and bear against the face of the disk 2|. The rear ends of the bolts 23 carry nuts 25 which may be rotated to tension or release the bolts.

-A substantially circular shallow boss 26 projecting from the face of the disk 2| provides support for a suitable straight edge 21 in the form of a straight flat blade of uniform width and thickness throughout its length. The lower half of the boss 28 is cut away to form a flat seat 28 for the blade 21 and to form a straight shoulder 29 which coactswith the upper edge of the blade to accurately align and position the latter. In this instance the blade 2! lies within a plane disposed normal to the axis of rotation of the disk 2| and forwardly of the disk and with the upper edge of the disk intersecting that axis.

The blade is releasably gripped by and between the shoulder 29 and a clamp dog 30 carried by the lower end of a rod 3| that extends vertically through the boss 26 and is equipped with a suitable nut 32 at its upper end. The nut 32 is shown provided with a depending tubular skirt 33 which serves as a spacer designed to position the nut beyond the periphery of the plate l3 where it is readily accessible for easy manipulation.

It will of course be understood that, upon releasing the nut 32, the blade 21 may be adjusted lengthwise to any deslredposition where it can be securely retained by again tightening the nut 32; upon releasing the nut 20 the blade 21 can be elevated to any desired position by adjustment of the shoe l4 along the vertical standard Ill; and upon releasing the nuts 25 the disk 2| may be rotated in a manner to adjust the blade 21 to any angular or inclined position desired. As a guide in angularly adjusting the blade, a suitable scale 34, graduated in angular degrees, is provided on the face of the flange 22 behind the upper edge of the blade and by which the inclination of the blade may be ascertained at a glance.

From an inspection of Figure 2 it will be noted that no part of the protractor projects forwardly beyond the face of the blade 21 so that there is no obstruction that in any manner interferes with the direct application or the latter against the upright face of the casting or other body to which the layout process is to be applied. This direct contact of the blade against the work is important from the standpoint of accuracy. It will also be further noted however that the blade 21 and the parts which support it are relatively compact, their forward extent being insufllcient to throw the device out of balance, the base II being sufficient at all times to retain the standard in the desired. vertical position without manual aid or support from any source other than the horizontal surface of the layout table.

Various changes may be made in the embodiment of the invention hereinabove specifically described without departing from or sacrificing the advantages of the invention as defined in. the appended claims.

I claim:

1. In a layout tool the combination of a standard, a carrier vertically adjustable thereon, a member rotatably adjustable on said carrier, a blade comprising a straight edge lengthwise adjustable on said member, and a supporting base adapted to rest upon a horizontal surface and to sustain said standard in vertical position beside a work piece, said blade being disposed forwardly of said standard and base and having a face exposed throughout its length for direct application to an upright face of said work piece.

2. In a layout tool the combination of a standard, a carrier vertically adjustable thereon, a member rotatably adjustable on said carrier, a blade comprising a straight edge lengthwise adjustable on said member, a supporting base adapted to rest upon a horizontal surface and to sustain said standard in vertical position beside a work piece with said blade disposed forwardly of said standard and base, and means for releasably fixing said blade in adjusted position on said member, said means and member being disposed to avoid forward projections such as would interfere with direct application of said blade against an upright face of said work piece.

3. In a layout tool the combination of a standard, a carrier vertically adjustable thereon, a member rotatably adjustable on said carrier, a blade comprising a straight edge lengthwise adjustable on said member, a supporting base adapted to seat upon a horizontal surface and to sustain said standard in, vertical position with said blade disposed forwardly of said standard and base, and clamp means on said member coacting with the edges of said blade to releasably secure the latter in any position of adjustment with the forward face of said blade exposed throughout its length. i j

4. In a layout tool the combination of a standard having a supporting base, a carrier vertically adjustable on said standard, a member rotatably adjustable on said carrier, a blade comprising a straight edge, said member having an open seat on the front face thereof for receiving said blade and a shoulder engaging an edge of said blade, and a clamp engaging the opposite edge of said blade and cooperating with said shoulder to releasably fix said blade on said member.

5. In a layout tool the combination of a standard having a supporting base, a shoe vertically adjustable on said standard, a circular carrier plate on said shoe forwardly of said standard, a disk rotatably seated on said carrier, clamp means on said plate coacting with the front face of said disk for releasably retaining the same in various positions of adjustment thereon, a longitudinally adjustable blade comprising a straight edge mounted forwardly of said disk and of said clamp means, and means carried by said disk for releasably retaining said blade in various positions of adjustment on said disk.

6. In a layout tool the combination of a standard having a supporting base, a carrier vertically adjustable on said standard, a disk mounted on the front of said carrier for rotatable adjustment in a plane parallel to and in advance of said standard, a blade comprising a straight edge mounted for lengthwise adjustment on the front of said disk, said blade having an exposed face disposed in a plane arallel to and in advance of said standard, means for releasably fixing said disk in various positions of rotative adjustment, and means for releasably fixing said blade in various positions of lengthwise adjustment, both of said means being disposed behind said face of said blade to permit direct application of the latter to the face of a work piece.

7. In a layout tool the combination of a standard, a carrier vertically adjustable on said standard, a disk mounted on the front of said carrier for rotatable adjustment in a plane parallel to and in advance of said standard, a blade comprising a straight edge mounted for lengthwise adjustment on the front of said disk, said blade having an exposed face disposed in a plane parallel to and in advance of said standard, means for releasably fixing said disk in various positions of rotative position, means for releasably fixing said blade in various positions of lengthwise adjustment, both of said means being disposed behind said face of said blade to permit direct application of the latter to the face of a work piece, and a heavy base extending rearwardly from said standard to sustain the latter in vertical position.

VASSILI MARK LUZI. 

